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Python Python Collections (2016, retired 2019) Dictionaries Teacher Stats

Help creating a function most_courses that takes teachers and their courses, then returns name of teacher w/most courses

So, a dictionary of teachers and their varying courses is passed through a method I need to make called most_courses that should return the name of the teacher with the most courses. I am not sure why my code isn't working correctly. Any advice?

def most_courses(teachers_and_courses):
    max_count = max(teachers_and_courses.values())
    for teacher in teachers_and_courses: 
        if teacher_and_courses.values() == max_count:
            return teacher